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qemu-e2k/target/riscv/cpu.h
Bin Meng b93777e1b4 target/riscv: Generate the GDB XML file for CSR registers dynamically 
At present QEMU RISC-V uses a hardcoded XML to report the feature
"org.gnu.gdb.riscv.csr" [1]. There are two major issues with the
approach being used currently:

- The XML does not specify the "regnum" field of a CSR entry, hence
  consecutive numbers are used by the remote GDB client to access
  CSRs. In QEMU we have to maintain a map table to convert the GDB
  number to the hardware number which is error prone.
- The XML contains some CSRs that QEMU does not implement at all,
  which causes an "E14" response sent to remote GDB client.

Change to generate the CSR register list dynamically, based on the
availability presented in the CSR function table. This new approach
will reflect a correct list of CSRs that QEMU actually implements.

[1] https://sourceware.org/gdb/current/onlinedocs/gdb/RISC_002dV-Features.html#RISC_002dV-Features

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210116054123.5457-2-bmeng.cn@gmail.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2021-01-16 10:57:21 -08:00

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/*
* QEMU RISC-V CPU
*
* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
* Copyright (c) 2017-2018 SiFive, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef RISCV_CPU_H
#define RISCV_CPU_H
#include "hw/core/cpu.h"
#include "hw/registerfields.h"
#include "exec/cpu-defs.h"
#include "fpu/softfloat-types.h"
#include "qom/object.h"
#define TCG_GUEST_DEFAULT_MO 0
#define TYPE_RISCV_CPU "riscv-cpu"
#define RISCV_CPU_TYPE_SUFFIX "-" TYPE_RISCV_CPU
#define RISCV_CPU_TYPE_NAME(name) (name RISCV_CPU_TYPE_SUFFIX)
#define CPU_RESOLVING_TYPE TYPE_RISCV_CPU
#define TYPE_RISCV_CPU_ANY RISCV_CPU_TYPE_NAME("any")
#define TYPE_RISCV_CPU_BASE32 RISCV_CPU_TYPE_NAME("rv32")
#define TYPE_RISCV_CPU_BASE64 RISCV_CPU_TYPE_NAME("rv64")
#define TYPE_RISCV_CPU_IBEX RISCV_CPU_TYPE_NAME("lowrisc-ibex")
#define TYPE_RISCV_CPU_SIFIVE_E31 RISCV_CPU_TYPE_NAME("sifive-e31")
#define TYPE_RISCV_CPU_SIFIVE_E34 RISCV_CPU_TYPE_NAME("sifive-e34")
#define TYPE_RISCV_CPU_SIFIVE_E51 RISCV_CPU_TYPE_NAME("sifive-e51")
#define TYPE_RISCV_CPU_SIFIVE_U34 RISCV_CPU_TYPE_NAME("sifive-u34")
#define TYPE_RISCV_CPU_SIFIVE_U54 RISCV_CPU_TYPE_NAME("sifive-u54")
#if defined(TARGET_RISCV32)
# define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE32
#elif defined(TARGET_RISCV64)
# define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE64
#endif
#define RV32 ((target_ulong)1 << (TARGET_LONG_BITS - 2))
#define RV64 ((target_ulong)2 << (TARGET_LONG_BITS - 2))
#if defined(TARGET_RISCV32)
#define RVXLEN RV32
#elif defined(TARGET_RISCV64)
#define RVXLEN RV64
#endif
#define RV(x) ((target_ulong)1 << (x - 'A'))
#define RVI RV('I')
#define RVE RV('E') /* E and I are mutually exclusive */
#define RVM RV('M')
#define RVA RV('A')
#define RVF RV('F')
#define RVD RV('D')
#define RVV RV('V')
#define RVC RV('C')
#define RVS RV('S')
#define RVU RV('U')
#define RVH RV('H')
/* S extension denotes that Supervisor mode exists, however it is possible
to have a core that support S mode but does not have an MMU and there
is currently no bit in misa to indicate whether an MMU exists or not
so a cpu features bitfield is required, likewise for optional PMP support */
enum {
RISCV_FEATURE_MMU,
RISCV_FEATURE_PMP,
RISCV_FEATURE_MISA
};
#define PRIV_VERSION_1_10_0 0x00011000
#define PRIV_VERSION_1_11_0 0x00011100
#define VEXT_VERSION_0_07_1 0x00000701
enum {
TRANSLATE_SUCCESS,
TRANSLATE_FAIL,
TRANSLATE_PMP_FAIL,
TRANSLATE_G_STAGE_FAIL
};
#define MMU_USER_IDX 3
#define MAX_RISCV_PMPS (16)
typedef struct CPURISCVState CPURISCVState;
#include "pmp.h"
#define RV_VLEN_MAX 256
FIELD(VTYPE, VLMUL, 0, 2)
FIELD(VTYPE, VSEW, 2, 3)
FIELD(VTYPE, VEDIV, 5, 2)
FIELD(VTYPE, RESERVED, 7, sizeof(target_ulong) * 8 - 9)
FIELD(VTYPE, VILL, sizeof(target_ulong) * 8 - 1, 1)
struct CPURISCVState {
target_ulong gpr[32];
uint64_t fpr[32]; /* assume both F and D extensions */
/* vector coprocessor state. */
uint64_t vreg[32 * RV_VLEN_MAX / 64] QEMU_ALIGNED(16);
target_ulong vxrm;
target_ulong vxsat;
target_ulong vl;
target_ulong vstart;
target_ulong vtype;
target_ulong pc;
target_ulong load_res;
target_ulong load_val;
target_ulong frm;
target_ulong badaddr;
target_ulong guest_phys_fault_addr;
target_ulong priv_ver;
target_ulong vext_ver;
target_ulong misa;
target_ulong misa_mask;
uint32_t features;
#ifdef CONFIG_USER_ONLY
uint32_t elf_flags;
#endif
#ifndef CONFIG_USER_ONLY
target_ulong priv;
/* This contains QEMU specific information about the virt state. */
target_ulong virt;
target_ulong resetvec;
target_ulong mhartid;
/*
* For RV32 this is 32-bit mstatus and 32-bit mstatush.
* For RV64 this is a 64-bit mstatus.
*/
uint64_t mstatus;
target_ulong mip;
uint32_t miclaim;
target_ulong mie;
target_ulong mideleg;
target_ulong sptbr; /* until: priv-1.9.1 */
target_ulong satp; /* since: priv-1.10.0 */
target_ulong sbadaddr;
target_ulong mbadaddr;
target_ulong medeleg;
target_ulong stvec;
target_ulong sepc;
target_ulong scause;
target_ulong mtvec;
target_ulong mepc;
target_ulong mcause;
target_ulong mtval; /* since: priv-1.10.0 */
/* Hypervisor CSRs */
target_ulong hstatus;
target_ulong hedeleg;
target_ulong hideleg;
target_ulong hcounteren;
target_ulong htval;
target_ulong htinst;
target_ulong hgatp;
uint64_t htimedelta;
/* Virtual CSRs */
/*
* For RV32 this is 32-bit vsstatus and 32-bit vsstatush.
* For RV64 this is a 64-bit vsstatus.
*/
uint64_t vsstatus;
target_ulong vstvec;
target_ulong vsscratch;
target_ulong vsepc;
target_ulong vscause;
target_ulong vstval;
target_ulong vsatp;
target_ulong mtval2;
target_ulong mtinst;
/* HS Backup CSRs */
target_ulong stvec_hs;
target_ulong sscratch_hs;
target_ulong sepc_hs;
target_ulong scause_hs;
target_ulong stval_hs;
target_ulong satp_hs;
uint64_t mstatus_hs;
target_ulong scounteren;
target_ulong mcounteren;
target_ulong sscratch;
target_ulong mscratch;
/* temporary htif regs */
uint64_t mfromhost;
uint64_t mtohost;
uint64_t timecmp;
/* physical memory protection */
pmp_table_t pmp_state;
/* machine specific rdtime callback */
uint64_t (*rdtime_fn)(uint32_t);
uint32_t rdtime_fn_arg;
/* True if in debugger mode. */
bool debugger;
#endif
float_status fp_status;
/* Fields from here on are preserved across CPU reset. */
QEMUTimer *timer; /* Internal timer */
};
OBJECT_DECLARE_TYPE(RISCVCPU, RISCVCPUClass,
RISCV_CPU)
/**
* RISCVCPUClass:
* @parent_realize: The parent class' realize handler.
* @parent_reset: The parent class' reset handler.
*
* A RISCV CPU model.
*/
struct RISCVCPUClass {
/*< private >*/
CPUClass parent_class;
/*< public >*/
DeviceRealize parent_realize;
DeviceReset parent_reset;
};
/**
* RISCVCPU:
* @env: #CPURISCVState
*
* A RISCV CPU.
*/
struct RISCVCPU {
/*< private >*/
CPUState parent_obj;
/*< public >*/
CPUNegativeOffsetState neg;
CPURISCVState env;
char *dyn_csr_xml;
/* Configuration Settings */
struct {
bool ext_i;
bool ext_e;
bool ext_g;
bool ext_m;
bool ext_a;
bool ext_f;
bool ext_d;
bool ext_c;
bool ext_s;
bool ext_u;
bool ext_h;
bool ext_v;
bool ext_counters;
bool ext_ifencei;
bool ext_icsr;
char *priv_spec;
char *user_spec;
char *vext_spec;
uint16_t vlen;
uint16_t elen;
bool mmu;
bool pmp;
uint64_t resetvec;
} cfg;
};
static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext)
{
return (env->misa & ext) != 0;
}
static inline bool riscv_feature(CPURISCVState *env, int feature)
{
return env->features & (1ULL << feature);
}
#include "cpu_user.h"
#include "cpu_bits.h"
extern const char * const riscv_int_regnames[];
extern const char * const riscv_fpr_regnames[];
extern const char * const riscv_excp_names[];
extern const char * const riscv_intr_names[];
const char *riscv_cpu_get_trap_name(target_ulong cause, bool async);
void riscv_cpu_do_interrupt(CPUState *cpu);
int riscv_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request);
bool riscv_cpu_fp_enabled(CPURISCVState *env);
bool riscv_cpu_virt_enabled(CPURISCVState *env);
void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable);
bool riscv_cpu_force_hs_excep_enabled(CPURISCVState *env);
void riscv_cpu_set_force_hs_excep(CPURISCVState *env, bool enable);
bool riscv_cpu_two_stage_lookup(int mmu_idx);
int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch);
hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
MMUAccessType access_type, int mmu_idx,
uintptr_t retaddr);
bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
MMUAccessType access_type, int mmu_idx,
bool probe, uintptr_t retaddr);
void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
vaddr addr, unsigned size,
MMUAccessType access_type,
int mmu_idx, MemTxAttrs attrs,
MemTxResult response, uintptr_t retaddr);
char *riscv_isa_string(RISCVCPU *cpu);
void riscv_cpu_list(void);
#define cpu_signal_handler riscv_cpu_signal_handler
#define cpu_list riscv_cpu_list
#define cpu_mmu_index riscv_cpu_mmu_index
#ifndef CONFIG_USER_ONLY
void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env);
int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts);
uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value);
#define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value */
void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(uint32_t),
uint32_t arg);
#endif
void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv);
void riscv_translate_init(void);
int riscv_cpu_signal_handler(int host_signum, void *pinfo, void *puc);
void QEMU_NORETURN riscv_raise_exception(CPURISCVState *env,
uint32_t exception, uintptr_t pc);
target_ulong riscv_cpu_get_fflags(CPURISCVState *env);
void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong);
#define TB_FLAGS_MMU_MASK 7
#define TB_FLAGS_PRIV_MMU_MASK 3
#define TB_FLAGS_PRIV_HYP_ACCESS_MASK (1 << 2)
#define TB_FLAGS_MSTATUS_FS MSTATUS_FS
typedef CPURISCVState CPUArchState;
typedef RISCVCPU ArchCPU;
#include "exec/cpu-all.h"
FIELD(TB_FLAGS, VL_EQ_VLMAX, 2, 1)
FIELD(TB_FLAGS, LMUL, 3, 2)
FIELD(TB_FLAGS, SEW, 5, 3)
FIELD(TB_FLAGS, VILL, 8, 1)
/* Is a Hypervisor instruction load/store allowed? */
FIELD(TB_FLAGS, HLSX, 9, 1)
bool riscv_cpu_is_32bit(CPURISCVState *env);
/*
* A simplification for VLMAX
* = (1 << LMUL) * VLEN / (8 * (1 << SEW))
* = (VLEN << LMUL) / (8 << SEW)
* = (VLEN << LMUL) >> (SEW + 3)
* = VLEN >> (SEW + 3 - LMUL)
*/
static inline uint32_t vext_get_vlmax(RISCVCPU *cpu, target_ulong vtype)
{
uint8_t sew, lmul;
sew = FIELD_EX64(vtype, VTYPE, VSEW);
lmul = FIELD_EX64(vtype, VTYPE, VLMUL);
return cpu->cfg.vlen >> (sew + 3 - lmul);
}
static inline void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
target_ulong *cs_base, uint32_t *pflags)
{
uint32_t flags = 0;
*pc = env->pc;
*cs_base = 0;
if (riscv_has_ext(env, RVV)) {
uint32_t vlmax = vext_get_vlmax(env_archcpu(env), env->vtype);
bool vl_eq_vlmax = (env->vstart == 0) && (vlmax == env->vl);
flags = FIELD_DP32(flags, TB_FLAGS, VILL,
FIELD_EX64(env->vtype, VTYPE, VILL));
flags = FIELD_DP32(flags, TB_FLAGS, SEW,
FIELD_EX64(env->vtype, VTYPE, VSEW));
flags = FIELD_DP32(flags, TB_FLAGS, LMUL,
FIELD_EX64(env->vtype, VTYPE, VLMUL));
flags = FIELD_DP32(flags, TB_FLAGS, VL_EQ_VLMAX, vl_eq_vlmax);
} else {
flags = FIELD_DP32(flags, TB_FLAGS, VILL, 1);
}
#ifdef CONFIG_USER_ONLY
flags |= TB_FLAGS_MSTATUS_FS;
#else
flags |= cpu_mmu_index(env, 0);
if (riscv_cpu_fp_enabled(env)) {
flags |= env->mstatus & MSTATUS_FS;
}
if (riscv_has_ext(env, RVH)) {
if (env->priv == PRV_M ||
(env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) ||
(env->priv == PRV_U && !riscv_cpu_virt_enabled(env) &&
get_field(env->hstatus, HSTATUS_HU))) {
flags = FIELD_DP32(flags, TB_FLAGS, HLSX, 1);
}
}
#endif
*pflags = flags;
}
int riscv_csrrw(CPURISCVState *env, int csrno, target_ulong *ret_value,
target_ulong new_value, target_ulong write_mask);
int riscv_csrrw_debug(CPURISCVState *env, int csrno, target_ulong *ret_value,
target_ulong new_value, target_ulong write_mask);
static inline void riscv_csr_write(CPURISCVState *env, int csrno,
target_ulong val)
{
riscv_csrrw(env, csrno, NULL, val, MAKE_64BIT_MASK(0, TARGET_LONG_BITS));
}
static inline target_ulong riscv_csr_read(CPURISCVState *env, int csrno)
{
target_ulong val = 0;
riscv_csrrw(env, csrno, &val, 0, 0);
return val;
}
typedef int (*riscv_csr_predicate_fn)(CPURISCVState *env, int csrno);
typedef int (*riscv_csr_read_fn)(CPURISCVState *env, int csrno,
target_ulong *ret_value);
typedef int (*riscv_csr_write_fn)(CPURISCVState *env, int csrno,
target_ulong new_value);
typedef int (*riscv_csr_op_fn)(CPURISCVState *env, int csrno,
target_ulong *ret_value, target_ulong new_value, target_ulong write_mask);
typedef struct {
const char *name;
riscv_csr_predicate_fn predicate;
riscv_csr_read_fn read;
riscv_csr_write_fn write;
riscv_csr_op_fn op;
} riscv_csr_operations;
/* CSR function table constants */
enum {
CSR_TABLE_SIZE = 0x1000
};
/* CSR function table */
extern riscv_csr_operations csr_ops[];
void riscv_get_csr_ops(int csrno, riscv_csr_operations *ops);
void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops);
void riscv_cpu_register_gdb_regs_for_features(CPUState *cs);
#endif /* RISCV_CPU_H */
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